#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 

int main()
{

  CIN( string , C0 );
  CIN( string , C1 );
  const string C = C0 + C1;
  ll answer = 0;
  ll num = 0;
  
  for( ll i = 0 ; i < 14 ; i++ ){

    const string c = C.substr( i , 1 );

    if( c == "o" ){

      num++;
      
    } else {

      if( answer < num ){

	answer = num;

      }

      num = 0;

    }
    
  }

  if( answer < num ){

    answer = num;

  }

  cout << answer << endl;
  return 0;

}